Suggested starting exposure times in J-band mode for an H-magnitude=5 is 45 seconds when observing with a coronagraph.
The zero-point of each channel in J-band mode is given below, the max zero-point is J = 17.8 mag.
![J Zero Point](/sites/g/files/toruqf4741/files/styles/freeform_750w/public/charis/files/wmsd5n7tifzwgaaaabjru5erkjggg.png?itok=QXYt7aVP)
The curve below shows the 2-read saturation limit with no coronagraph. The maximum allowable magnitude to avoid saturation is J = 7.2 mag
![J 2 Read Saturation](/sites/g/files/toruqf4741/files/styles/freeform_750w/public/charis/files/2ogmcqopxwpl8xvp5xpv9xleuataypkwbdoekokihw0gz2uz313w2qdz9vt9dbtdbbdbtadtxa9xtsytfqof9seb3ksw21e3yzaadad5imaaaar4graadgftecaac8ikyaaibxxagaapckgaeaaf4riwaawctibaaaeewmaaaar4graadgftecaac8ikyaaibxxagaapdqax3ktjfudzcxaaaaae.png?itok=__h7SWGO)
NOTE: Throughput of SCExAO rebuild and AO performance on any particular night will affect these numbers. Strehl ratios of 60-80% were estimated when this data was taken